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Glandore Hydroponic Nutrients, Lights and Equipment
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Lower leaves dying fast - need urgent help!

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15 replies to this topic

#1
Lollygag

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Hi Stoners
Got a problem with my plants, hoping someone can shed some light.

They're 6 weeks old from seed, & now in veg under a 400 hps.
Nutes are 'Thrive' 12.4 N, 3.0 P, 6.2 K ½ strength dosage, about 1 feed per week.
Temp range is 27 – 30C, humidity at about 50%.
Soil is 2/3 Yates Thrive premium potting mix (it was cheap) and 1/3 vermiculite with a little dolomite lime. I added a 1/4 teaspoon of epsom salts per 2 litres to the last feed.

I am also dealing with spider mites using a nicotine spray, but they're pretty much under control, though by no means vanquished. I'm worried they have goven my plants a disease?

I've checked pH 3 times with two different kits, it's between 5.5 & 6.
I flushed last night in case of salt build up nute lock out but it appears that's not the problem, as the die off has continued since.

Leaves appear to turn yellow from the tips moving inward, grey splotches which then turn brown in the middle of the leaf, then it shrivels & dies. It's happening really fast. Only older leaves are affected, new growth seems fine.

I have attached two photos for comparison, one pic is from yesterday, the other from today.
You can see how leaves that were chlorotic and mottled yesterday are dead today.

Any advice would be greatly appreciated.

Attached Files


Edited by Lollygag, 12 November 2006 - 01:25 PM.

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#2
Lollygag

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Another plant comparison
Yesterday and today:

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#3
Lollygag

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The problem seems restricted to older leaves near the bottom of the plants, new growth is a nice dark green, as you can see in the attached images.

I treated with a systemic fungicide about an hour ago in case it's a fungal infection, it may or may not help, but it won't hurt them.

I have 6 plants, all are affected, these 2 pictured are the worst.

Any suggesstions advice or ideas would be greatly appreciated.

Thanks

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#4
SukonmiSkunk

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its a classic nitrogen difficiency... starts at the lower leaves and works its way up... what are you feeding it?? this is a sure sign that the nutrients in that pot are depleated.. you can either start feeding with an all round hydroponic vegetive nutrient.. or repot into some fresh soil.. looks to me like it will need repotting soon any way...

spidermites.. i just use a yates buggun... or a confidor bug gun.. works well just repeat 3 days later to be sure... best to get the mite problem sorted now before flowering....

apart from that the plant is looking good.. the new growth is looking fine... pluck those shitty leaves off.. they will not recover... and repot.. should be fine in a day or 2...
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#5
Stoney

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give them ladies some urea or do what i do in soil and once ya see a diff start get them on hydro nutes asap

all should be good once they get some nitrogen into them

cheerz :Dj:
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#6
Lollygag

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Thanks guys, I'm a little wary of venturing in to hydro shops - worried police might be watching, so no hydro nutes, but I gave a full strength feed of charlie carp (9 : 2 : 6).
Hopefully they'll pick up soon.

Also repotted the one in the grey pot, as mentioned by Sukonmiskunk, she was getting a little big for that pot, and she's definitely a she so I don't want to restrict her growth any more than the N def. might have already. :thumbsup:
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#7
everest

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i've had a few probs in the past with adding the vermiculite , it holds too much water for mj plants ... i changed to perlite and never had any more bother .. ganja plants like to dry out completly .... before being re- watered thus pulling the nutes out of the soil .

ev :thumbsup:
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WantDaChronic

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it doesnt seem like a nitrogen deficiency to me as the vast majority of the plant is a lovely green colour and from what i have seen in my own grow room that looks like a classic case of being rootbound :thumbsup: but seeing those spots on the leaves + having the pH around 5.5-6.0 has me thinking that the pH is a little lower than what it should be for a soil grow so i would up the pH to around 6.0-6.5 and transplant the plant into a much larger pot :xcited:
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#9
Tom

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but seeing those spots on the leaves + having the pH around 5.5-6.0 has me thinking that the pH is a little lower than what it should be for a soil grow so i would up the pH to around 6.0-6.5 and transplant the plant into a much larger pot

Yeah the PH is definitely too low, I would look at 6.5 - 6.8. You will also find that many potting mixes contain slow release fertilisers which can be harsh on young plants and must be taken into account when fertilising them, when using potting soil I avoid the ones containing them.

:thumbsup:
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#10
Lollygag

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spidermites.. i just use a yates buggun... or a confidor bug gun.. works well just repeat 3 days later to be sure... best to get the mite problem sorted now before flowering....


Yup, you're right. I gotta deal with the issue now, I was really hoping to avoid the chemicals, but there doesn't seem to be a way around it. I'm wary of pest oil since I used it on my mite infested basil earlier this year and it killed it. I bought some confidor, thanks for the tip. ;)
I'm still very wary of insecticides so I only sprayed one plant today, just to make sure there wont be ill effects, I'll spray the others tommorow.

i've had a few probs in the past with adding the vermiculite , it holds too much water for mj plants ... i changed to perlite and never had any more bother .. ganja plants like to dry out completly .... before being re- watered thus pulling the nutes out of the soil .

ev :xcited:


I know! i spaced out in bunnings and walked out the door with bags of vermiculite rather than perlite – the packaging is the same, it wasn't till i opened a bag and saw the colour & texture that I realised my mistake.
lol
Hopefully it'll be OK, humidity is fairly low here so the soil will get a chance to dry, I'll have to be careful about it though.

or do what i do in soil


:P! I think I get what you're saying there Stoney, and I see from your grow threads it works, but i don't think I can circumvent my prissy girly housewife neuroses enough to follow through on that one.

it doesnt seem like a nitrogen deficiency to me as the vast majority of the plant is a lovely green colour and from what i have seen in my own grow room that looks like a classic case of being rootbound :thumbsup: but seeing those spots on the leaves + having the pH around 5.5-6.0 has me thinking that the pH is a little lower than what it should be for a soil grow so i would up the pH to around 6.0-6.5 and transplant the plant into a much larger pot B)


I didn't think N deficiency either due to the dark green colour of the tops, but I'm pretty n00b & given their history it would make sense – I've only fed ¼ to ½ strength nutes once a week. Another point that speaks of N def. is that those 2 pictured are the 2 biggest, most sativa influenced and so probably the 2 hungriest plants. Also the only 2 that have definitely shown sex. I'm thinking if they weren't deficient before they probably are now after yesterday's flushing.

I've repotted both those pictured now, they were a little rootbound, but I wouldn't have thought so grievously as to be dying off like that.

Yeah the PH is definitely too low, I would look at 6.5 - 6.8. You will also find that many potting mixes contain slow release fertilisers which can be harsh on young plants and must be taken into account when fertilising them, when using potting soil I avoid the ones containing them.


The pH is definitely a little on the low side, I've been attempting to correct it by adding dolomite lime to waterings, probably the vermiculite that pushed the pH down – i've read somewhere it's a bit acidic. PH is closer to 6 than 5.5 so should be just within the bounds of acceptable. I'll buy some pH up tomorrow though, it's an easy problem to fix and it'll serve them well in the long term.

The prefert factor was partially what led me to flush initially, thinking it was a salt build up nute lock out.

Just to add to the uncertainty, I have no idea what strain I'm growing, was a bloody nice smoke though. :D
Possibly the combination of slight acidity, slight rootbinding and N deficiency all collaborated to produce the massive die off?
Hopefully I've got it covered now...

Thanks for all your help guys :D
I really appreciate all the advice and suggestions.
Happy growing
:peace:

Edited by Lollygag, 12 November 2006 - 11:34 PM.

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Glandore Hydroponic Nutrients, Lights and Equipment
Barneys Farm Cannabis Seeds
WARNING/DISCLAIMER The OZ Stoners cannabis community contains information regarding cannabis & other drugs; it is designed for mature (18+) audiences only. This site in no way condones the use of cannabis by minors. The content here within this cannabis community is for educational & entertainment purposes only. Any buying/selling or trading of illegal cannabis seeds, clones, flowers, resin or oil is strictly prohibited within this cannabis community.